Zebralette has two LFOs (one per voice, one global), a multi-stage envelope and three on-board effects (chorus, EQ, delay). Not forgetting Zebra2's famous dual spectral effects, which include several squelchy filter algorithms.

STVRZ, this one is on a lot of short lists - i.e. the word is out. But chiming in: very rich timbre, distinctive presets, highly malleable. I was blown away by this plugin, and yet the demo of the commercial version somehow manages to top (have not purchased it yet, but if U-He wanted to distinguish themselves, this did the trick). The graphical interface is great fun. Best compliment is to say I have used it on several tracks.

One of the most interesting free synths for sure! It has good sound quality,low CPU load, very pleasant looking wodden-style GUI, detailed documentation, amazing factory presets and vast user-made preset library (https://www.u-he.com/PatchLib/zebra.html#zlette). Another important feature is it's workflow, which is differs from other synths - thanks to the spectral FX section. Yeah, maybe it is just a reduced version of U-He's commercial plugin, but hey, does it matter, if Zebralette is so awesome on its own?

10 stars. I know, I've posted my opinion all over this site, but this is the best free synth out there. It will do ANYTHING. It sounds FANTASTIC. I don't normally gush about u-he stuff because of the CPU load, but comfortably run this with other synths and vocs no problem. I cannot believe no one else has not posted on this already. I am saving up for the real ZEBRA2. The ZebraCM is also fantastic albeit not totally free (magware) and much more conventional.